package com.itheima.reggie.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.dao.CategoryDao;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.service.ICategoryService;
import com.itheima.reggie.web.exception.CustomException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, Category> implements ICategoryService {
    @Autowired
    private DishServiceImpl dishService;
    @Autowired
    private SetmealServiceImpl setmealService;

    /**
     * 根据id删除分类，删除之前需要判断
     *
     * @param id
     */
    @Override
    public void remove(Long id) {
        LambdaQueryWrapper<Dish> dishQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件,根据分类id查询
        dishQueryWrapper.eq(Dish::getCategoryId, id);
        int count = dishService.count(dishQueryWrapper);
        //1.查询分类是否关联菜品
        if (count > 0) {
            //已关联菜品，抛出业务异常
            throw new CustomException("当前分类下关联了菜品，不能直接删除");
        }
        //2.查询当前分类时都关联套餐，如果已关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealQueryWrapper = new LambdaQueryWrapper<>();
        setmealQueryWrapper.eq(Setmeal::getCategoryId, id);
        int count1 = setmealService.count(setmealQueryWrapper);
        if (count1 > 0) {
            //已关联套餐，抛出业务异常
            throw new CustomException("当前分类下关联了套餐，不能直接删除");
        }
        //3.正常的删除方法
        super.removeById(id);
    }
}
